Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aa81836fe05ca4…

MALICIOUS

PDF

53.9 KB Created: 2020-09-07 22:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a474a5b9f0d5c828990bba47b9ff150 SHA-1: 13278e8e3d8624307f43538089246f31209ba69a SHA-256: 53aa81836fe05ca45f48586b0d4069925866c2a5801813883bb22f547673e51b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=self+development+in+performance+appraisal+examples'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is also identified as a potential IOC. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/pify?keyword=self+development+in+performance+appraisal+examples
    • https://static.usrfiles.com/ugd/6c032c_31575063a0154cd2af2cc0fbe8827610.pdf
    • https://static.usrfiles.com/ugd/7f614e_01983c32d1074332b5147789e425c12e.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_395fb32e4f354f3eb0f77465351ee700.pdf
    • https://static.usrfiles.com/ugd/b8c837_3344b4bb45944211a8dbb4d1fccaef30.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/u_bahn_berlin_karte.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/berajab.pdf
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/peter_pan_2003_movie_download_in_hin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/43596272338.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/selenium_webdriver_cheat_sheet_java.pdf
    • https://static.usrfiles.com/ugd/3649d2_2bcfff433b0f43e791a994af0cdebbc3.pdf
    • https://static.usrfiles.com/ugd/80bfa9_38045b58e0c64315a52042124ab06627.pdf
    • https://static.usrfiles.com/ugd/24853a_730f15623e9f48f3ad0b4c7686974a69.pdf
    • https://static.usrfiles.com/ugd/69695d_a9e408f26a8a4f148f981a5b9b7fde5f.pdf
    • https://static.usrfiles.com/ugd/60933b_77fcec347fa5491db07c377c48a615da.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009494.bin
02028f30a2086f2f5a60a965f41c03cd62eb5f83f935c09f54c9c5861f476df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9494 5532 bytes
font_01_sfnt_off0000a75d.bin
0578fc291115d86e0918e7d69abe8bbd4210ec0eaa6b20eb12bf441474d6f16c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA75D 10272 bytes

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